And it seems setting her sights on flavour of the month Rita Ora has incited a little girl crush in her.

The Rude Boy singer was seen grabbing the British star to plant a generous smooch on the cheek at the birthday party for Roc Nation executive Tyran 'Ty-Ty' Smith.

Girl smooch: British singer Rita Ora, who's often compared to Rihanna, posted this Twitter picture of the Umbrella singer giving her a kiss on the cheek at Jay-Z's party

As Rihanna lunged in, she clutched Rita's face as both girls closed their eyes in the moment.

The Hot Right Now star tweeted the photo following the London soiree after checking out Kanye West and Jay-Z in concert, accompanied with the caption: '@rihanna hatin a$$ biatch!!!! Mwah!!!!!!'

Also at the party at the DSTRKT club in Piccadilly on Saturday night was Gwyneth Paltrow, Stella McCartney, Kanye West, Kim Kardashian, Rob Kardashian and Dianna Agron.

Headed for a meltdown As Rihanna showed off her new tiara and matching body harness last night, as her butler followed with booze, the pop star sparked more fears that she's been burning the candle on both ends

Despite being hospitalised for 'exhaustion' earlier this month – thanks to a jam-packed schedule of performing, promoting, and partying – Rihanna is well and truly back on the social circuit.

It is not the first time she has teased fans with her sexual preferences, last month saying she was going 'on a date' with female best friend Melissa Forde.

And as she showed off her new tiara and matching body harness, with a loyal butler following closely behind with champagne, the popstar sparked more fears that she's burning the candle on both ends.

Accompanied by a female friend wearing hotel slippers, the 24-year-old bombshell wore black trousers and a matching jacket with a deep plunging neckline, revealing her sexy torso and framing her perky assets.

Changing faces: Rihanna enjoys a night at Boujis in London last night, completely covered up

The exhausted Umbrella singer took to her Twitter today to make it known that she will soon be taking a much-needed break from promoting her new film Battleship among other duties.

'You will be very disappointed to know last night was my final hurrah til my vacation! I ain't about this life,' the best-selling Barbadian recording artist tweeted to her 19 million followers.

Earlier today, Rihanna posted an interesting photo on her Instagram of a woman smoking a joint so enormous it required three women to hold it up and a fourth to light it.

Harnessing Rihanna: The 24-year-old popstar stepped out of her hotel in a tiara with a matching intimate body harness under her suit, which framed her perky assets

Smoking soul mate: Earlier today, Rihanna posted a photo on her Instagram of a woman smoking a joint so enormous it required three women to hold it up and a fourth to light it

'Why she suckin on my soul mate' tweeted the singer, who has called marijuana aficionado and reggae legend Bob Marley her 'hero'.

When photos of Rihanna appearing to roll a marijuana blunt on her bodyguard's head emerged from the Coachella Music Festival in April, she irreverently addressed the snaps by tweeting, '@rihanna ran out of f***s to give.'

'I'm crazy, and I don't pretend to be anything else,' she tweeted at the time.

Her last 'hurrah': The exhausted Umbrella singer took to her Twitter today to make it known that she would be taking a much-needed break from promoting her new film Battleship

'Good Girl Gone Bad': A few nights after she was seen dancing in Hollywood with a bottle of champagne in her hands, and two weeks ago she was rushed to hospital after partying at the Met Gala in New York

The hard-partying star missed her flight out of London the other day after attending a star-studded party held by Jay-Z and Kanye West – where she kissed Rita.

She woke up still drunk with lapses in memory of her night out.

'U know life is great when u wake up at 9 am DRUNK!!!!! #London #happybirthdayTYTY #G4L #H0Navy,' tweeted the Disturbia singer.

Cheer up! Kanye West and Kim Kardashian looked grim as they left the party on Saturday night